License of project files created with Blender
Yes, you can do whatever you want with your files when you create them. Blender's license does not have any restrictions on the work you produce with it. In fact it has very few restrictions on what you can do with Blender itself.  

You can read the license here: http://www.gnu.org/licenses/gpl-3.0.html 

The license also comes with Blender itself - in its installation folder you will find GPL3-license.txt file with all the text of it.